Pump for hydraulic jacks and other purposes.



No. 833,457. PATENTED OCT. 16, 1906.

` H. HAMMOND.

' 'PUMP FOR HYDRAULIC JAGKS AND OTHER PURPOSES.

APPLICATION FILED AUG.11,.193

' 2 SHEETS-SHEET 1.

No. 833,457. PATBNTED OCT. 16, 1906.

H. HAMMOND. v

V PUMP POR HYDRAULIC JACKS AND OTHER PURPOSES.

PPPPPPPPPPPPPPPP AUG.11.1903.

UNITED STATES PATENT. euries.

HERBERT HAMM-OND, or CRADLEY HEATH, ENGLAND.' AssieNoa To JAMES W. NELSON. 0E NEW YORK, N. Y.

PUMP Fon HYDRAULIG .uAoKs AND vori-1ER PunPosEs.

Specification bf Letters Patent.

Application levd August 11, 1908. Serial No. 169.152.

in the county of Stafford, England, 'have invented certa-in new and -useful Improvements in Pumps for I-I draulic Jacksand other Purposes, of Whic the following is a specification.

-My invention relatesA to improvements in hydraulic pumps, such as are used for testing pressures, hoistin machinery, presses, lifting-'asks and the 'ke purposes.

Te ump involves a piston having portions o different diameters a casing for the piston of different internal diameters,l checkvalves arranged to directl coperate with the respective portions of t e piston, and an additional check-valve arranged to coperate directly with the larger ortion of the piston, means being rovided or putting the ast-mentioned chec -valve into an inoperative position whereby I can secure the advantages hereinafter described.

- In the drawings, Figure 1 is a sectional elevation of my invention on line A B, Fig. 2. 2 is a sectional plan of the invention on line C D, Fig. 1f sition of the valve t ough which the Water passes to the under side of the lower lunger.

Similar reference-numbers refer t oughout the views to the same thing or part.

I have illustrated this my invention 'as ap-` plied to a hydraulic lifting-jack as an example; but it will be readily seenthat it may ually be applied to similar apparatus for ot rpu-rposes.

The plunger is made of two diameters-l that is to say, the lower lunger 4 isan extension from the upper arger plun er 4a. The cylinder 5l is mad-e to agree with t etwo diameters of the plun ers. A general inletvalve 6 is provided, w 'ch admits the water through the gauze covering 7 to the chamber 8 beneath the lar er lunger 4a. A water- Apassage 9 is made ea ing from the chamber 8 to the non-return valve 10, which said.v

valve is held to its seating by sprl 11. Hence, when the plungers are rais by means of the lever 12` or other device the water is drawn from the reservoir 13 through the valve 6 into the chamber 8 and also down Fl 3 Shows a modified pothe passa e 9 into the chamber`14 below the bottom p unger 4. A

" From the chamber 14 the outlet is provided With the non-return valve 15, through which the Water is forced to the pressurechamber .above the ram 16.

resented ose 1e, 190e. Y

It will benoted that the passage 9 serves the A l ldouble purpose of providing a means of supply to t e chamber 14 and a means ofdelivery from the chamber 8 through the chamber 14 to the pressure-chamber.

I may, if desired, not put the valve 10 in the lunger, as shown in Fig. 1, but lane it in t .cylinder at the side of the p unger, with suitable passages leading from the chamber 8 to thechamber 14. (See Fig. 3.)

17 is a cam formed on the end of the spindle 18, which latter is suitably carried in the frame 20 of the machine and capable of rotation by the square formation 21 or other means. The urpose of this spindle and cam is that w 4en the cam is placed at its lva ve 6 is free to open and close in the ordihighest position, as shown in Fig. 1, the

nary manner; but when the said spindle is `l I turned through half a revolution the valve is ushed and held downward from off its seat.

onsequently, as the plungers descend the Water which lies above the valve 10 is forced back through the -now open yvalve 6, and

therefore the water only below the valve 1-0 is forced through the valve 15 to the ram 16, and by reason of the comparative diminuation of area of the plunger 4 to that of thev plunger/1a so the force is increased.' Hence when the lower power is required the valve 6y the object being to trip the valve when re-I quired. y

By these means various o ations may be performed much quicker t n 'by resent apparatus, such as the preliminary f ling of vessels to be tested or bringing up the pressure to near the final/stagqwhi e in other cases it affords racticall two :sizes -oflifting-jack'or the etac e in one ImachJ'ne, e and its compactness permits its appllcabihty to replace Amuch apparatus now 1n use, as 1t re uires practically no more s ace.

, e 1n the'foregoing speclcation I have referred to water as the iluid employed, it is obvious that any other substantially noncompressible uid would answer the samel p ose.

at I claim as my invention, and desire' to secure by Letters Patent, is-

1.` The combination of a piston having portions of different diameters, a casing for the piston, of different internal diameters, two check-valves arranged to directly co crate with the res e'ctive portions of the iston, an additionacheck-valve arrange tocoperate directly with the larger portion of the pis ton, and means for putting the lastmentioned check-valve into an inoperative position.

-2. The combination of a piston having a portion of large diameter and a portion of small diameter, the latter constitutinga prolongation of the former, a casing for-the piston, of internal form, 'to agree wlth the external shape of the piston and'havin an inlet.-

` passa e in communicationwith t e casin two c eck-valves arranged to coperate d1- -rectly with the large and small ortions of thepiston,y and an additional chec -valve Ylocated substantially at the enteringend of said'inlet-passage, arranged to djrectlyiand normally7 coperate with the larger portion of the piston and to be moved into an moperatlve position independently ofthe action of the piston',

3. The combination of a cylinder and a ram, a piston having portions of different diameters, a casing for the iston, of different l internal diameters, said" piston and its casing being o eratively associat'ed'gwith the cylinder an ram, two check-valves arranged to d lrectly coperate with the respective 'portlons of the piston, and an `additional checkvalve arranged to normally `and directl cooperate wit the larger portion ofthe piston and to be moved into an inoperative position independently of the action of the piston.

4. In a deviceof'the class described, vthe combination with a cylinder and ram, ofv a pump-block com rising bores of different diinder, and pistons in sai and corres on the combination o chambers, Aa valve in said ving` a reservoir amm-chamber, two pumps ding pump-chambers, the com- I bination o a valved passage from reservoir to first pum chamber, means for controlling I operation o said valve, a valved assage connectn the two .pump-cham, rs, and -a v7e valve assage between the last pump-chamber an the ram-chamber.

6. Ina device of the class described having' a reservoir, a ram-chamber, a double pump andy correspondingl pump-chambers,

a ui -passage from reservoir. to ram-chamber with whichl both pump-chambers communicate, valves in said passage, one controlling inlet, one controlling outlet, and one controlling iiow from onel8o ump-chamber to the other, and means for oldlng the first-mentioned valve off its seat. 7. In a device of the class described, the. combination, with a reservoir, a ram-chamber, a double pump and corresponding pumpchambers, of a uidassa e from reservoir to ram-chamberwhic udes the last one of said pump-chambers, a valve controlling inlet from said reservoirl a valve cbntrolllng `outlet t'o said ram-chamber and a valve con- 9o trolling'iiow from one pum -chamb'er tothe other, and means for contro ing operation of said first-mentioned valve. 4

8. In a device of the class described, the combination, with a-reservoir,`a ram-chamber, a double pump and corresponding pumpchambers, of a fluid-passage om reservolr to first pump-chamber, a valv said passa e, means for controlling operation of said va ve, a valved fluid-passage from said rst me ump-chamber to the second pump-chamer, and a valved fluid-passage from sald second pump-chamber to the ram-chamber. 9.In a device ofthe class described, the combination, with a'ram-chamber and a resroy, ervoir, of two communicating pump-chambers arranged. tandem, one ,connnumcatmg with -the reservoir and the other with the ram-chamber, avalve controll' commumcation betweenthe two pump-c ambers, a ne valve controlling the communication be- -tween the ram-chamber and the pump- Ichamber communicating w1th 1t, a valve 1 controll' communication between the. reserv'r an the'pump-chamber communicatx15 ing with it, means for rendering the lastnamed valve inoperative, and plstons 1n the pump-chambers..

10. In a device of the character described, the' combination', with al cylinder and ram :zo and a reservoir, of two pump-chambers arranged tandem, one commumcating wlth the reservoir and the other with` the cylmder, v connected pistons.` in `said pump-chambers,

.said pistons having a passage to establish x25 communication between the two pump- I assage, va valve controlling the-communicatlon between the controllpump-chambers and said oglinder, a-hvalve etween t e resvcommunication ervoir an said chambers, and means for rendering the last-named valve imperative.

11. In a device of the class escribed, the combination, with a ram-chamber and a reservoir, of two pumpchambers arranged tandem and one being of greater diameter than theother, a valved assage connecting the reservoir with the ch ameter, means for renderin erative, a valved passage pump-chambers, a valved passage between the smaller pump-chamber and the ramchamber, an bers.

12. A device of the class described having etween the two two pump-pistons and corresponding pump-f chambers, a supply-chamber,- a rassurechamber, and a passage from sai supplychamber to one pump-chamber a part of which also serves as a means of communication between the other pump-chamber and said pressure-chamber. 13. A device of the class described having a supply-chamberf a large pump-chamber, a

-small pump-chamber, and a passage leading amber of greatest di the valve inop-I pistons in said pumpeham` Pump from said supply-v a pressurechamber,

ychamber to said small pump-chamber with which said lare pump-chamber communicates, all of sai passages serving as a means of supply to thereof also servmg as a pressure-passage from large pump-chamber to said pressurechamber.

a pressure-chamber, a larger pumpchamber, a 'smaller pump-chamber, means for supply# ing a liquid to the smaller pum chamber which comprises a passage throng a part of the pump-chambers and a part 35 v 14. A device of the class described-having which the hquld is forced from the larger s -chamber on its way` to the pressurechamber, and a valve arranged in said passa e.

n' testimony whereof I have vsigned my name to this specification in the presence of .two subscribing Witnesses.' l d -HERBERT HAMMOND.

`Witnesses: 'y

' C. HAYWARD PowELL,' J. BRNABD HaYWAnD 

